Optical Power Handling: up to 50 W
Aperture: 8 mm
Switching Speed: 20 ms
Logic Position Sensors
Optics: Metal & Dielectric
Submit RFQ


Safety Interlock
Diverging Beams
Tight Zones
OEM Integration Top Loader
Consult With Us

Optical Specifications

Aperture Diameter 8.0 mm
Typical Beam Diameter 2.0 to 6.0 mm
Max. Optical Power Handling 50 W (Dielectric Optics)
Optics Options Aluminum, Dielectric, Gold
Dielectric Optics Suffix 1064 nm (-1), 532 nm (-2), 355 nm (-3),
266 nm (-4), 532/1064 nm (-12)
Metal Optics Suffix CO2 (-C2), IR (-IR), STD (-AL)
Damage Threshold 500 mJ/cm2 at 10 ns

Performance Specifications

Open Delay Time 5 ms
Open Rise Time 15 ms
Open Total Time 20 ms
Close Delay Time 5 ms
Close Fall Time 15 ms
Close Total Time 20 ms
Min. FWHM Exposure 30 ms
Max. Shutter Repetition Rate 5 Hz
Lifetime 50 Million Cycles

Thermal Specifications

Thermal Power Dissipation Holding Open 4 W
Thermal Power Dissipation Cycling 10 W at 5 Hz
Mounting Surface for Thermal Sinking Datum A, Datum B

Custom Options

Aperture Size Range 8 mm, 10 mm,
8 x 12 mm Obround
Wire Length Any Length
Wire/Cable Type Wire Gauge Teflon or Vinyl
Connector Any 6-pin Connector
Identification Engraving, Labels

Electrical Specifications

Power Supply 24 VDC, 1 Amp Rating
Electrical Drive Circuit Boost Open = 24 V at +45 ms
Hold Open = 7 V
Delay Close = 8 ms
Brake Close = 24 V for 6 ms
Winding Resistance 15 ohms Nominal
Winding Inductance 10 mH
Position Sensors Logic TTL, Require 5 VDC @ 30 mA
Cable Type, Length, Termination Six wires, 22 g, 18 in.,
MTA-100, AMP, P/N 643813-60
Recommended Controller CX4000B
User Drive Circuit/Cap Discharge 24 V, C=4700 mmF, R=50 ohm, use Flyback Diode 1N4001
User Drive Circuit/PWM Type 24 V for 50 ms, then drop to 7 V hold, use Flyback Diode 1N4001
Read sensor outputs with reference to the blue ground wire. These outputs are totem-pole buffered TTL, seeking a load of ~10 K ohms. Typical output is 4.5 V. Do not try to draw more than about 5 mA from the Yellow or Orange outputs, or the voltage will load down.

Wire Pin # - Color

1 – Red Power Winding (+)
2 – Black Power Winding (-)
3 – Violet Sensor Supply, 5 VDC(+) – 30 mA
4 – Yellow Normally Open Sensor (HI – Open)
5 – Orange Normally Closed Sensor (HI – Close)
6 – Blue 5V Return and Sensor Ground


Dimensions 3.80 in. x 2.06 in. x 0.64 in.
Weight ~4 oz.
Classification Safety/Process
Gravity Considerations Symmetric Open/Close speed with base down. More power used for upside-down mounting
Specifications Date April 27, 2021


The LST400 laser shutter model is designed for use as a laser safety interlock and processing applications. The LST400 provides TTL output position sensors for the open and closed states as standard equipment. The thin body style and 8 mm aperture accommodate many popular laser sources. The –IR suffix replaces the over-coated aluminum mirror with gold. Choose -C2 for CO2 laser use. Compatible system controllers are CX4000B or user-built circuits designed around 24 VDC. Options are available using a suffix code system. Many options cannot be installed after manufacture, so choose carefully. Choose the –IR suffix for IR use, starting at about 700 nm. The standard over-coated aluminum mirror is good from deep UV to about 700 nm. Special dielectric mirrors are available for OEM applications. Cable options are also available, call for details. Special considerations for this model include damage threshold assessment. The shutter is not designed for high energy, low repetition rate, Joule-level Q-switched lasers. See LST800 for these applications. Thermal mounting must be given strong attention if optical power dissipation is near the upper limit of the rating. For high-speed processing, consider the LST200SLP. Restricted use for this model is only limited to damage threshold and wavelength considerations. It can be used in any orientation with regards to gravity; more symmetric switching in standard mounting. See the Mechanical Drawing tab for dimensions. Also see the Application Notes in the Technical Information menu for important operational issues including: thermal mounting, user-built circuits, polarization, lifetime, jitter, vacuum operation, and contamination. See the Product Matrix page to compare laser shutter models.